JPS62294376A - Reader - Google Patents

Abstract

PURPOSE:To easily control the accuracy of a distance between object images at the reading part of a moving document and a still document, by performing the reading of the moving and the still documents using the same reading transparent plate. CONSTITUTION:A reading transparent plate 23(reading glass) is provided over a documant reading part 21, and a moving document reading part 22. The reading of the moving document is performed by resting a mobile optical device 37 beneath a moving document supporting plane 23b, and setting a document 25 at a prescribed position on the upper plane of a closing cover 35. The document 25 is delivered in order by a paper supplying roller 28, and a carrying roller 29, and passes the moving document supporting plane 23b on the upper plane of the reading glass 23, and is read by the mobile optical device 37 resting beneath the plane. The reading of the still document is performed by moving the mobile optical device 37 from the read start point C of the still document reading part 21 in a subscan direction represented by arrow head A, keeping a state that the closing cover 35 is opened, and a document 24 is placed on the still document supporting plane 23a of the reading glass 23, and the document is pressed by a document presser 26.

Description

[Detailed Description of the Invention] 3. Detailed Description of the Invention Field of Industrial Application ' The present invention relates to a document reading device for a facsimile machine or a copying machine, and particularly to a document reading device for reading a stationary document and a moving document. Regarding the reading device that can be used.

2. Description of the Related Art Conventionally, as shown in FIG. 2, this type of apparatus has a stationary original reading section 1, a moving original reading section 2, and a moving optical device 3 for reading which can move both reading sections 1.2. The stationary document reading section 1 is provided with a reading glass 5 on which a document 4 is placed flatly, and a document presser 6 that presses the document 4 against the reading glass 5. A paper roller 8, a conveying roller 10 and a presser roller 11 arranged on both sides of the reading position B to convey the original 7, an original guide 12 for guiding the original, a reading glass 13 provided at the reading position B, etc. are provided. There is. In this apparatus, when reading a stationary original 4, the moving optical device 3
The scanning of the moving document 7 is carried out while moving in the direction of arrow A (sub-scanning direction) along the moving optical device 3 at the reading position B.
This is done by stopping the original 7 below the reading position B and passing the reading position B.

Further, as shown in FIG. 3, the reading surface of the moving document reading section 2 is arranged at right angles to the reading surface of the stationary document reading section 1, and the optical path is changed by a mirror 15 for switching the optical path. There is also known an arrangement in which the moving optical device 3 is configured to switch between the two and read a stationary 3''-' document and a moving document.

Problems to be Solved by the Invention However, with such a configuration, the stationary document reading section and the movable document reading section 2 are separated within the same device, so reading accuracy management is complicated and diverse, and the number of parts used is also high. become more,
This makes it extremely difficult not only to stabilize quality but also to downsize the device.

The above-mentioned problem occurs for the following reasons: In order to perform good reading, it is important to control the accuracy of the distance between the object and image planes of the reading section. It is necessary to set the distance of each reading glass of each section to the moving optical device constant, but since the reading glasses are each provided separately, it is difficult to adjust the position. Further, in the apparatus shown in FIG. 3, since the optical path is switched by a mirror, it is necessary to precisely control the positional accuracy of the mirror angle and the stoppage of the moving optical device, and this accuracy control is difficult. Furthermore,
Conventional devices use a conveyance roller and a press roller that sandwich and convey the document to convey the moving document, so the conveyance roller or the press roller protrudes toward the moving optical device side beyond the reading glass. It is difficult to use a moving optical device with a short distance between object and image planes, and it is also difficult to miniaturize the device.

In addition, in conventional devices, the stationary document reading section and the moving document reading section are separate, so dust and the like can easily enter the device, resulting in deterioration of reading due to dirt caused by dust and the like.
There is also a problem in terms of maintenance of the device, which makes it extremely difficult to use.

The present invention has been made in view of the above-mentioned problems, and it is easy to accurately control the distance between object images in the reading unit for moving and stationary documents, and does not require optical axis switching using a mirror. The purpose is to provide a low-cost, small and lightweight reading device.

Means for Solving the Problems In order to solve the above-mentioned problems, the present invention provides a flat reading transparent plate that extends across both the stationary original reading section and the moving original reading section, and this reading transparent plate has a , forming a stationary document support surface on which the document is placed flatly and a movable document support surface through which the moving document 5'-. It is equipped with a configuration in which an optical device is arranged.

Effect of the Invention With the above-described configuration, the present invention is capable of reading a stationary document by moving the moving optical device in the sub-scanning direction below the document placed on the stationary document support surface of the reading transparent plate. Furthermore, the moving optical device can be stopped below the moving document supporting surface of the reading transparent plate, and the moving document can be read by passing the document through the moving document supporting surface. At this time, since the stationary document support surface and the moving document support surface are formed on the same transparent plate for reading, it is easy to equalize the distance between the object image planes of the moving optical device in both integration sections, and the reading Since there is no protruding part on the lower surface of the transparent plate, it is possible to use a close-contact type moving optical device with a short distance between object and image planes.

Example 6′ Hereinafter, the present invention shown in FIG. 1 will be explained in detail.

FIG. 1 shows a schematic configuration of a reading device according to an embodiment of the present invention, in which 21 is a stationary original reading section, 22 is a moving original reading section, B is a stationary original reading section 2], a moving original reading section 22020 is a flat reading transparent plate (hereinafter referred to as reading glass) made of glass or the like that extends upward. On the upper surface of the reading glass, a stationary document support surface 23a on which a stationary document is placed flatly and a moving document support surface 23b through which a moving document section passes are formed on the same plane. 26 is a document part that presses the stationary document path against the reading glass;
is a document moving means that transports the document so that the document Z5 passes through the document support surface 23b. This document moving means a includes a paper feed roller 4 that feeds out the document portion placed above the document portion 26 one by one, and a document support surface 23b that moves the document portion.
It has a conveyance roller 29 that conveys the document while pressing against it, a discharge roller that discharges the document, a document guide 31, a document receiver 32, and the like. The document unit 26 and the document moving means 27 are both held by an opening/closing lid 35 that can be pivoted about a pin 34 located on an extension of the upper surface of the reading glass field.

Reference numeral 37 denotes a movable optical device for reading the original 24 or 5 on the reading glass 23'', and is movably provided along the reading glass 23'' with a constant distance between it and the reading glass 2:3. Reference numeral 38 denotes a drive device that causes the moving optical device 37 to travel.

Next, a reading operation by the above device will be explained. First, in order to read a moving document, the moving optical device 37 is kept stationary at the illustrated position, that is, below the moving document support surface 23b, and the document 5 is set at a predetermined position on the upper surface of the opening/closing lid 35. This document Z5 is pulled out one after another by the paper feed roller 4 and the conveyance roller 29, and is moved to the moving document support surface 2 on the upper surface of the reading glass 23. '3
The moving optical device 3 passes through b and is stopped below it.
7.

Next, to perform static document reading, open the opening/closing lid 35 and
With the document 24 placed on the stationary document support surface 23a of the reading glass 23 and pressed by the document surface plate 26, the moving optical device 37
is moved from the reading start point C of the stationary original reading unit 2 in the sub-scanning direction shown by arrow A to perform reading.

In this way, in both stationary original reading and moving original reading, the original surface is located on the common upper surface of the reading glass.
By keeping the traveling position of the moving optical device 37 parallel to this reading glass, it is possible to maintain a uniform distance between the object image planes of the optical system in both readings, and - it is possible to easily reduce reading variations within the device to a certain level of accuracy. It can be assembled and managed. In addition, since there is no protruding part on the lower surface of the reading glass over the entire traveling range of the moving optical device 37, the moving optical device 37 may be of a contact type with a short distance between object and image planes, such as a contact type image sensor. can be used, making it possible to make the device smaller and lighter. In addition, the moving optical device 37
Since the traveling range of the moving optical device 37 is covered by a single sheet of reading glass 23, dirt, dust, etc. are prevented from entering the device, and problems caused by dust adhering to the moving optical device 37 are eliminated.

In the above embodiment, the moving document reading section 22 is arranged on the left side of the stationary document reading section 21. This structure makes it possible to arrange the reading position of the original reading moving unit 22 near the reading start point C of the stationary original reading unit 21, and to change the reading position from the moving original reading operation to the stationary original reading operation 9t-1/. This is preferable because the moving time of the moving optical device can be reduced when switching or vice versa.

Effects of the Invention As is clear from the above description, the present invention provides a flat reading transparent plate that extends across both the stationary original reading section and the moving original reading section, and the original is placed on the reading transparent plate. By forming a stationary document support surface on which the moving document is placed and a moving document support surface through which the moving document passes, and disposing a moving optical device that runs along the reading transparent plate below the reading transparent plate, It is now possible to use the same transparent reading plate to read stationary originals and to read moving originals, making it easy to equalize the distance between the object image planes of the moving optical device in both readings. It is possible to easily assemble and manage reading variations to a certain level of accuracy, and since there is no protruding part such as a groove on the bottom surface of the transparent reading plate, it is possible to use a close-contact type moving optical device with a short distance between object and image planes. By using this, it is possible to make the device smaller and lighter, and furthermore, since the reading transparent plate 10' prevents dirt and dust from entering the moving optical device below, it is possible to reduce the size and weight of the device. This has the effect of preventing problems caused by adhesion of dust, etc.

[Brief explanation of drawings]

FIG. 1 is a schematic sectional view of a reading device according to an embodiment of the present invention, and FIGS. 2 and 3 are schematic sectional views of conventional reading devices.

Claims (1)

[Claims] a flat reading transparent plate having a stationary document support surface on which the document is placed flatly and a moving document support surface through which the moving document passes;
A document presser for holding down the document placed on the stationary document support surface; a document moving means for conveying the document so that the document passes through the moving document support surface; A reading device that includes a moving optical device that is arranged to travel along a plate and reads a document on a transparent reading plate.